论文标题
t $ _d $ -mote $ _2 $中的光诱导的层中层动力学：宽带泵探针研究
Photoinduced Interlayer Dynamics in T$_d$-MoTe$_2$: A Broadband Pump-Probe Study
论文作者
论文摘要
我们报告了在T $ _D $ -MOTE $ _2 $的散装单晶上执行的时间分辨宽带瞬态反射率（TR-BB-TR）测量结果，这是入射泵通量（F）的函数。 TR-BB-TR数据揭示了在子秒时间尺度上进行的光诱导的电子变化以及连贯的低频$^1A_1 $ Interlayer剪切剪切声子的动力学。我们的结果表明，TR和$^1A_1 $傅立叶强度光谱的逐渐演变是F的函数，排除了与超快光诱导的$ t_d \ t_d \ to t_1t'$相位过渡相关的类似阈值的变化。我们还观察到了$^1A_1 $傅立叶光谱特征的大红移，这表明对$^1A_1 $ Interlayer phonon phonon位移的频带间过渡发生了巨大的重新归一化效应。
We report on time-resolved broadband transient reflectivity (tr-bb-TR) measurements performed on a bulk single crystal of T$_d$-MoTe$_2$ as a function of the incident pump fluence (F). Tr-bb-TR data unveil photoinduced electronic changes progressing on the sub-picosecond timescale as well as the dynamics of the coherent low-frequency $^1A_1$ interlayer shear phonon. Our results indicate a gradual evolution of both the TR and the $^1A_1$ Fourier intensity spectra as a function of F, ruling out the threshold-like change that has been associated with the ultrafast photoinduced $T_d \to 1T'$ phase transition. We also observe a large redshift of the $^1A_1$ Fourier spectral features, which suggests that large renormalization effects are taking place on interband transitions that are dielectrically susceptible to the $^1A_1$ interlayer phonon displacement.
